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Introduction


Air spaced etalons reduce the temperature dependence problem by using air as the etalon medium, to greatly reduce the change in  refractive index with temperature. The mirror spacing is now determined by spacers that may still be made from Fused Silica or by even more stable materials such as ULE or Zerodur.   


Air spaced etalons are significantly more complex since there are now three components involved, two end mirrors and the spacer. The outside surfaces of the end mirrors also need to be wedged and AR coated to avoid reflections from these surfaces causing additional unwanted etalon effects.

Air Spaced Etalons

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